Alex can ensure their instance is working properly

[seadowg]

As Alex
I want to be able to run a set of tests that check my instance is working properly
So that I can rollback a broken version or warn people that there will be problems

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ACCEPTANCE

GIVEN I am Alex
WHEN I have just installed or upgraded an instance of Postfacto
THEN I can run a set of tests against the instance
AND I can see whether the instance is working as expected or not

[tom025]

This relates to/extension of #150.

We should be running smoke tests on deployment.